Castletown Weather in September

September in Castletown brings moderate temperatures, with highs of 16°C (61°F) and nights dropping to 13°C (55°F). Rainfall is on the higher side this month, averaging around 92 mm (3.6 in), so keep a rain jacket handy.

Rainfall in Castletown in September

Based on our climate data of the past 30 years, about 16 days of rain are anticipated, with 92 mm (3.6 in) on average. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Castletown in September

Temperatures in Castletown in September top out at 16°C (61°F) and drop to 13°C (55°F) overnight. The difference between afternoon and evening temperatures is usually noticeable. Nights cool down to 13°C (55°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

So this is a great month to visit if you prefer dry days with pleasant temperatures.